/* 能源费用托管资料库 — 全站样式（站点正式名称待定，当前为工作名）
   风格：清爽信息型（浅色底、高信息密度、强可读性） */

:root {
  --c-primary: #185FA5;
  --c-primary-dark: #0C447C;
  --c-primary-50: #E6F1FB;
  --c-primary-100: #CFE4F7;
  --c-accent: #C2410C;
  --c-accent-50: #FDF0E8;
  --c-green: #0F6E56;
  --c-green-50: #E1F5EE;
  --c-text: #1A1D21;
  --c-text-2: #55606C;
  --c-text-3: #667080;
  --c-border: #E3E6EA;
  --c-border-strong: #CDD3DA;
  --c-bg: #FFFFFF;
  --c-bg-2: #F7F8FA;
  --c-bg-3: #EFF1F4;
  --radius: 8px;
  --radius-lg: 12px;
  --maxw: 1180px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei",
    "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-text);
  background: var(--c-bg);
}

a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

/* ---------- 布局 ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 52px 0; }
.section-sm { padding: 34px 0; }
.section-alt { background: var(--c-bg-2); border-top: 1px solid var(--c-border); border-bottom: 1px solid var(--c-border); }

/* ---------- 顶部栏 ---------- */
.topbar {
  background: var(--c-primary-dark);
  color: #CFE4F7;
  font-size: 13px;
  line-height: 34px;
}
.topbar .wrap { display: flex; justify-content: flex-end; align-items: center; }
.topbar a { color: #CFE4F7; }
.topbar-links { display: flex; gap: 18px; }

header.site {
  border-bottom: 1px solid var(--c-border);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 68px;
}
.brand { display: flex; align-items: center; gap: 11px; }
.brand-mark {
  width: 36px; height: 36px; border-radius: 7px;
  background: var(--c-primary);
  color: #fff; font-size: 17px; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
  flex: 0 0 auto;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name { font-size: 16.5px; font-weight: 600; color: var(--c-text); letter-spacing: .2px; }
.brand-sub { font-size: 11.5px; color: var(--c-text-3); letter-spacing: .3px; }

nav.main { display: flex; gap: 4px; flex-wrap: wrap; }
nav.main a {
  color: var(--c-text-2);
  font-size: 14.5px;
  padding: 7px 13px;
  border-radius: 6px;
  text-decoration: none;
  white-space: nowrap;
}
nav.main a:hover { background: var(--c-bg-3); color: var(--c-text); }
nav.main a.active { color: var(--c-primary); background: var(--c-primary-50); font-weight: 500; }

/* ---------- 移动端汉堡菜单 ---------- */
.nav-toggle, .nav-toggle-label { display: none; }
@media (max-width: 980px) {
  .nav-toggle-label {
    display: flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 40px; height: 40px; padding: 10px 11px; cursor: pointer;
    border-radius: 7px; border: 1px solid var(--c-border); background: var(--c-bg-2);
  }
  .nav-toggle-label span { display: block; height: 2px; background: var(--c-text); border-radius: 1px; }
  .nav-toggle:checked ~ nav.main {
    display: flex; position: absolute; left: 0; right: 0; top: 68px;
    background: #fff; border-bottom: 1px solid var(--c-border);
    flex-direction: column; gap: 2px; padding: 10px 16px 14px;
  }
  .nav-toggle:checked ~ nav.main a { padding: 11px 13px; font-size: 15px; }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 20px; border-radius: 6px; font-size: 14.5px;
  border: 1px solid transparent; cursor: pointer; text-decoration: none;
  transition: .15s; font-family: inherit; line-height: 1.4;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-dark); }
.btn-outline { border-color: var(--c-border-strong); color: var(--c-text); background: #fff; }
.btn-outline:hover { border-color: var(--c-primary); color: var(--c-primary); }
.btn-sm { padding: 6px 14px; font-size: 13.5px; }
.btn-lg { padding: 13px 28px; font-size: 16px; }

/* ---------- 首页 Hero ---------- */
.hero {
  background: linear-gradient(180deg, #F4F8FC 0%, #FFFFFF 100%);
  border-bottom: 1px solid var(--c-border);
  padding: 62px 0 54px;
}
.hero-grid { display: grid; grid-template-columns: 1fr 340px; gap: 48px; align-items: start; }
.hero h1 {
  font-size: 34px; line-height: 1.35; font-weight: 600;
  letter-spacing: -.3px; margin-bottom: 16px; color: var(--c-text);
}
.hero h1 em { font-style: normal; color: var(--c-primary); }
.hero-lead { font-size: 16px; color: var(--c-text-2); margin-bottom: 26px; max-width: 620px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 22px; }
.hero-note { font-size: 13px; color: var(--c-text-3); }

.hero-side {
  background: #fff; border: 1px solid var(--c-border);
  border-radius: var(--radius-lg); padding: 22px;
}
.hero-side h3 { font-size: 15px; font-weight: 600; margin-bottom: 14px; }
.hero-side-list { list-style: none; font-size: 14px; }
.hero-side-list li {
  padding: 10px 0; border-bottom: 1px dashed var(--c-border);
  display: flex; gap: 10px; color: var(--c-text-2);
}
.hero-side-list li:last-child { border-bottom: none; }
.hero-side-list b { color: var(--c-text); font-weight: 600; }

/* ---------- 数据条 ---------- */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--c-border); border-radius: var(--radius-lg);
  overflow: hidden; background: #fff;
}
.stat { padding: 20px 22px; border-right: 1px solid var(--c-border); }
.stat:last-child { border-right: none; }
.stat-num { font-size: 25px; font-weight: 600; color: var(--c-primary); line-height: 1.3; }
.stat-num small { font-size: 14px; font-weight: 400; color: var(--c-text-2); margin-left: 3px; }
.stat-label { font-size: 13px; color: var(--c-text-2); margin-top: 2px; }
.stat-src { font-size: 11.5px; color: var(--c-text-3); margin-top: 5px; }

/* ---------- 标题 ---------- */
.sec-head { margin-bottom: 26px; }
.sec-head h2 {
  font-size: 24px; font-weight: 600; letter-spacing: -.2px;
  margin-bottom: 7px; display: flex; align-items: center; gap: 10px;
}
.sec-head p { font-size: 14.5px; color: var(--c-text-2); max-width: 800px; }
.sec-head-row { display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; }
.sec-more { font-size: 14px; white-space: nowrap; }

/* ---------- 卡片网格 ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }

.card {
  background: #fff; border: 1px solid var(--c-border);
  border-radius: var(--radius-lg); padding: 22px;
  transition: .15s; display: flex; flex-direction: column;
}
.card:hover { border-color: var(--c-border-strong); }
.card-link:hover { text-decoration: none; box-shadow: 0 2px 12px rgba(24,95,165,.09); }

.card-icon {
  width: 38px; height: 38px; border-radius: 8px;
  background: var(--c-primary-50); color: var(--c-primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 17px; font-weight: 600; margin-bottom: 14px;
}
.card h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.card h3 + .card-sub { margin-top: -4px; }
.card-sub { font-size: 13.5px; color: var(--c-text-3); margin-bottom: 10px; }
.card p { font-size: 14px; color: var(--c-text-2); margin-bottom: 12px; }
.card ul { list-style: none; font-size: 14px; color: var(--c-text-2); margin-bottom: 14px; }
.card ul li { padding-left: 15px; position: relative; padding-top: 3px; padding-bottom: 3px; }
.card ul li::before {
  content: ""; position: absolute; left: 0; top: 13px;
  width: 5px; height: 5px; border-radius: 50%; background: var(--c-primary);
}
.card-foot { margin-top: auto; padding-top: 12px; }
.card code, .card li code, .notice code, .crumbs code {
  font-family: var(--font); background: var(--c-bg-3);
  padding: 1px 5px; border-radius: 3px;
  font-size: 12.5px; color: var(--c-text-2);
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-block; font-size: 12.5px; line-height: 1.6;
  padding: 1px 9px; border-radius: 4px;
  background: var(--c-bg-3); color: var(--c-text-2); white-space: nowrap;
}
.tag-blue { background: var(--c-primary-50); color: var(--c-primary-dark); }
.tag-green { background: var(--c-green-50); color: var(--c-green); }
.tag-accent { background: var(--c-accent-50); color: var(--c-accent); }
.tag-line { background: transparent; border: 1px solid var(--c-border-strong); }
.tag-row { display: flex; flex-wrap: wrap; gap: 7px; }

/* ---------- 锚点定位（避开吸顶导航） ---------- */
h2[id], div[id], section[id] { scroll-margin-top: 76px; }

/* ---------- 表格 ---------- */
.tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
.tbl th, .tbl td {
  text-align: left; padding: 12px 14px;
  border-bottom: 1px solid var(--c-border); vertical-align: top;
}
.tbl th {
  background: var(--c-bg-2); font-weight: 600; font-size: 13.5px;
  color: var(--c-text-2); white-space: nowrap;
}
.tbl tbody tr:hover { background: #FAFBFC; }
.tbl-wrap { border: 1px solid var(--c-border); border-radius: var(--radius-lg); overflow: hidden; overflow-x: auto; }

/* ---------- 认证等级 ---------- */
.level-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.level {
  border: 1px solid var(--c-border); border-radius: var(--radius-lg);
  padding: 24px; background: #fff; position: relative;
}
.level-head { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.level-dot { width: 11px; height: 11px; border-radius: 50%; flex: 0 0 auto; }
.level h3 { font-size: 18px; font-weight: 600; }
.level-en { font-size: 12px; color: var(--c-text-3); letter-spacing: .6px; text-transform: uppercase; }
.level-req { font-size: 13.5px; color: var(--c-text-2); margin: 12px 0 14px; padding-bottom: 14px; border-bottom: 1px dashed var(--c-border); }
.level ul { list-style: none; font-size: 14px; color: var(--c-text-2); }
.level ul li { padding-left: 16px; position: relative; padding-top: 4px; padding-bottom: 4px; }
.level ul li::before {
  content: ""; position: absolute; left: 0; top: 14px;
  width: 6px; height: 1.5px; background: var(--c-primary);
}
.level-l1 .level-dot { background: #97C459; }
.level-l2 .level-dot { background: var(--c-primary); }
.level-l3 .level-dot { background: var(--c-accent); }

/* ---------- 流程 ---------- */
.steps { counter-reset: step; }
.step {
  display: flex; gap: 18px; padding: 18px 0;
  border-bottom: 1px solid var(--c-border);
}
.step:last-child { border-bottom: none; }
.step-num {
  flex: 0 0 30px; height: 30px; border-radius: 50%;
  background: var(--c-primary-50); color: var(--c-primary-dark);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 600;
}
.step-body h4 { font-size: 15.5px; font-weight: 600; margin-bottom: 4px; }
.step-body p { font-size: 14px; color: var(--c-text-2); }

/* ---------- 空状态 ---------- */
.empty {
  border: 1px dashed var(--c-border-strong);
  border-radius: var(--radius-lg); padding: 44px 28px;
  text-align: center; background: var(--c-bg-2);
}
.empty h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.empty p { font-size: 14px; color: var(--c-text-2); max-width: 560px; margin: 0 auto 16px; }

/* ---------- 提示条 ---------- */
.notice {
  display: flex; gap: 12px; padding: 14px 18px;
  border-radius: var(--radius); font-size: 14px;
  background: var(--c-primary-50); color: var(--c-primary-dark);
  border-left: 3px solid var(--c-primary);
}
.notice-warn { background: var(--c-accent-50); color: #8A3410; border-left-color: var(--c-accent); }
.notice-green { background: var(--c-green-50); color: var(--c-green); border-left-color: var(--c-green); }
.notice b { font-weight: 600; }

/* ---------- 面包屑 ---------- */
.crumb { font-size: 13px; color: var(--c-text-3); padding: 16px 0 0; }
.crumb a { color: var(--c-text-3); }
.crumb a:hover { color: var(--c-primary); }
.crumb span { margin: 0 7px; }

/* ---------- 列表页标题 ---------- */
.page-head { padding: 22px 0 24px; border-bottom: 1px solid var(--c-border); }
.page-head h1 { font-size: 28px; font-weight: 600; letter-spacing: -.2px; margin-bottom: 8px; }
.page-head p { font-size: 15px; color: var(--c-text-2); max-width: 860px; }

.search-box {
  display: flex; gap: 0; flex: 1; min-width: 220px; max-width: 340px;
}
.search-box input {
  flex: 1; padding: 8px 13px; font-size: 14px; font-family: inherit;
  border: 1px solid var(--c-border-strong); border-right: none;
  border-radius: 6px 0 0 6px; outline: none; color: var(--c-text);
}
.search-box input:focus { border-color: var(--c-primary); }
.search-box button {
  padding: 8px 16px; font-size: 14px; font-family: inherit;
  background: var(--c-primary); color: #fff; border: none;
  border-radius: 0 6px 6px 0; cursor: pointer;
}

/* ---------- 表单 ---------- */
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px 22px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 14px; font-weight: 500; }
.field label .req { color: var(--c-accent); margin-left: 3px; }
.field .hint { font-size: 12.5px; color: var(--c-text-3); }
.field input, .field select, .field textarea {
  padding: 9px 13px; font-size: 14.5px; font-family: inherit;
  border: 1px solid var(--c-border-strong); border-radius: 6px;
  outline: none; color: var(--c-text); background: #fff; width: 100%;
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--c-primary); }
.field textarea { resize: vertical; min-height: 92px; line-height: 1.7; }

/* ---------- 资料条目 ---------- */
.res-list { border-top: 1px solid var(--c-border); }
.res-item {
  display: flex; gap: 16px; padding: 18px 0;
  border-bottom: 1px solid var(--c-border); align-items: flex-start;
}
.res-item:hover { background: #FAFBFC; }
.res-icon {
  flex: 0 0 46px; height: 46px; border-radius: 9px;
  background: var(--c-primary-50); color: var(--c-primary-dark);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 600; letter-spacing: .3px;
}
.res-icon.i-contract { background: var(--c-green-50); color: var(--c-green); }
.res-icon.i-tool { background: var(--c-accent-50); color: var(--c-accent); }
.res-body { flex: 1; min-width: 0; }
.res-title { font-size: 15.5px; font-weight: 600; margin-bottom: 5px; line-height: 1.55; }
.res-title a { color: var(--c-text); }
.res-title a:hover { color: var(--c-primary); }
.res-meta { font-size: 13px; color: var(--c-text-3); margin-bottom: 7px; }
.res-meta code {
  font-family: var(--font); background: var(--c-bg-3);
  padding: 1px 6px; border-radius: 3px; font-size: 12.5px; color: var(--c-text-2);
}
.res-desc { font-size: 14px; color: var(--c-text-2); }
.res-tags { margin-top: 8px; }
.res-act {
  flex: 0 0 152px; display: flex; flex-direction: column;
  align-items: flex-end; gap: 9px; padding-top: 2px;
}
.res-state { font-size: 12px; color: var(--c-text-3); }
.res-state.st-open { color: var(--c-green); }
.res-state.st-gate { color: var(--c-primary); }

/* ---------- 弹层 ---------- */
.modal-mask {
  display: none; position: fixed; inset: 0; z-index: 200;
  background: rgba(26,29,33,.5); align-items: center;
  justify-content: center; padding: 20px;
}
.modal-mask.on { display: flex; }
.modal {
  background: #fff; border-radius: var(--radius-lg);
  max-width: 470px; width: 100%; padding: 28px; position: relative;
}
.modal h3 { font-size: 19px; font-weight: 600; margin-bottom: 10px; }
.modal p { font-size: 14.5px; color: var(--c-text-2); margin-bottom: 14px; }
.modal-close {
  position: absolute; top: 12px; right: 14px; width: 30px; height: 30px;
  font-size: 20px; line-height: 1; color: var(--c-text-3);
  cursor: pointer; background: none; border: none; font-family: inherit;
}
.modal-close:hover { color: var(--c-text); }
.kw {
  display: flex; align-items: center; gap: 10px;
  background: var(--c-bg-2); border: 1px dashed var(--c-border-strong);
  border-radius: var(--radius); padding: 12px 16px;
  font-size: 14.5px; margin-bottom: 14px;
}
.kw b { color: var(--c-accent); font-size: 16px; letter-spacing: .6px; }
.modal-list {
  list-style: none; max-height: 54vh; overflow-y: auto;
  border-top: 1px solid var(--c-border); margin-bottom: 2px;
}
.modal-list li { padding: 12px 0; border-bottom: 1px solid var(--c-border); }
.ml-t { font-size: 14.5px; font-weight: 500; line-height: 1.6; margin-bottom: 3px; }
.ml-t a { color: var(--c-text); }
.ml-t a:hover { color: var(--c-primary); }
.ml-m { font-size: 12.5px; color: var(--c-text-3); line-height: 1.6; }
.ml-m code {
  font-family: var(--font); background: var(--c-bg-3);
  padding: 1px 5px; border-radius: 3px; color: var(--c-text-2);
}

/* ---------- 学习路径 ---------- */
.path-item {
  display: flex; gap: 18px; padding: 20px 0;
  border-bottom: 1px solid var(--c-border);
}
.path-item:last-child { border-bottom: none; }
.path-idx {
  flex: 0 0 42px; height: 42px; border-radius: 10px;
  background: var(--c-primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 600;
}
.path-body { flex: 1; min-width: 0; }
.path-body h3 { font-size: 17px; font-weight: 600; margin-bottom: 5px; }
.path-body > p { font-size: 14px; color: var(--c-text-2); margin-bottom: 12px; }
.path-lists { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 26px; }
.path-lists h5 {
  font-size: 13px; color: var(--c-text-3); font-weight: 500;
  margin-bottom: 5px; letter-spacing: .2px;
}
.path-lists ul { list-style: none; font-size: 13.5px; color: var(--c-text-2); }
.path-lists li { padding-left: 14px; position: relative; padding-top: 2px; padding-bottom: 2px; }
.path-lists li::before {
  content: ""; position: absolute; left: 0; top: 12px;
  width: 5px; height: 5px; border-radius: 50%; background: var(--c-primary);
}

/* ---------- 页脚 ---------- */
footer.site {
  background: #1E242B; color: #9AA5B1;
  padding: 48px 0 26px; margin-top: 20px; font-size: 14px;
}
.foot-grid { display: grid; grid-template-columns: 1fr 1.2fr auto; gap: 36px; }
.foot-qr { display: flex; gap: 18px; }
.foot-qr figure { margin: 0; text-align: center; }
.foot-qr img {
  width: 92px; height: 92px; display: block;
  border-radius: 8px; background: #fff;
}
.foot-qr figcaption { font-size: 12.5px; color: #9AA5B1; margin-top: 6px; }
.foot-brand { display: flex; align-items: center; gap: 11px; margin-bottom: 14px; }
.foot-brand .brand-mark { background: var(--c-primary); }
.foot-brand .brand-name { color: #fff; }
.foot-brand .brand-sub { color: #6E7A87; }
footer.site h4 { color: #fff; font-size: 14.5px; font-weight: 600; margin-bottom: 13px; }
footer.site ul { list-style: none; }
footer.site li { margin-bottom: 9px; }
footer.site a { color: #9AA5B1; }
footer.site a:hover { color: #fff; }
.foot-desc { font-size: 13.5px; line-height: 1.8; }
.foot-bottom {
  margin-top: 36px; padding-top: 20px; border-top: 1px solid #2C343D;
  font-size: 12.5px; color: #6E7A87; display: flex;
  justify-content: space-between; gap: 16px; flex-wrap: wrap;
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 30px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: none; }
  .stat:nth-child(1), .stat:nth-child(2) { border-bottom: 1px solid var(--c-border); }
  .grid-3, .grid-4, .level-grid { grid-template-columns: repeat(2, 1fr); }
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .foot-qr-col { grid-column: 1 / -1; }
  nav.main { display: none; }
}
@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .hero { padding: 38px 0 34px; }
  .hero h1 { font-size: 25px; }
  .grid-2, .grid-3, .grid-4, .level-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr; }
  .stat { border-right: none; border-bottom: 1px solid var(--c-border); }
  .form-grid { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr; }
  .foot-qr { gap: 14px; }
  .foot-qr img { width: 84px; height: 84px; }
  .section { padding: 36px 0; }
  .sec-head-row { flex-direction: column; align-items: flex-start; }
  .page-head h1 { font-size: 23px; }
  .res-item { flex-wrap: wrap; gap: 12px; }
  .res-act {
    flex: 0 0 auto; width: 100%; align-items: flex-start;
    flex-direction: row; align-items: center; gap: 12px;
  }
  .path-lists { grid-template-columns: 1fr; }
  .path-item { gap: 13px; }
  .path-idx { flex-basis: 36px; height: 36px; font-size: 14px; }
}

/* ---------- 品牌 Logo ---------- */
.brand-logo { height: 44px; width: auto; display: block; }
.brand-avatar { height: 44px; width: 44px; border-radius: 50%; object-fit: cover; display: block; border: 1px solid var(--c-border); }
.foot-logo { height: 38px; }

/* ---------- 知识库双分区（免费 / 付费） ---------- */
.part-head h2 { margin: 0 0 6px; }
.part-head h2 .tag { vertical-align: 3px; margin-left: 4px; }
.part-head p { margin: 0; font-size: 14.5px; color: var(--c-text-2); }

/* ---------- 知识库模块四宫格（语料构成 / 申请加入 / 使用教程 / 使用说明） ---------- */
.kb-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 18px; margin-top: 28px; }
.kb-box {
  border: 1px solid var(--c-border); border-radius: var(--radius-lg);
  background: #fff; padding: 20px 24px;
}
.kb-box h4 { font-size: 13.5px; font-weight: 600; margin: 0 0 14px; color: var(--c-text); }

.kb-join-box {
  display: flex; flex-direction: column; justify-content: center; align-items: flex-start;
  background: var(--c-accent-50); border-color: #F2D4BC;
}
.kb-slogan { font-size: 18px; color: var(--c-text); margin: 0 0 6px; line-height: 1.5; }
.kb-slogan b { font-weight: 700; color: var(--c-accent); }
.kb-slogan-sub { font-size: 13.5px; color: var(--c-text-2); margin: 0 0 16px; }

.kb-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 20px; }
.kb-stat b { display: block; font-size: 22px; font-weight: 600; color: var(--c-primary); line-height: 1.2; }
.kb-stat span { display: block; font-size: 12.5px; color: var(--c-text-2); margin-top: 2px; line-height: 1.5; }
.kb-note { font-size: 12.5px; color: var(--c-text-3); line-height: 1.7; margin: 14px 0 0; }

.kb-tutorial {
  display: flex; align-items: center; gap: 18px; padding: 18px 20px;
}
.kb-tutorial img { width: 46%; max-width: 250px; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 8px; display: block; flex: none; }
.kb-tutorial:hover { border-color: var(--c-primary); }
.kb-tutorial-txt { flex: 1; display: flex; flex-direction: column; gap: 6px; }
.kb-tutorial-txt b { font-size: 15px; color: var(--c-primary); font-weight: 600; line-height: 1.5; }
.kb-tutorial-txt span { font-size: 13px; color: var(--c-text-3); line-height: 1.6; }

.kb-usage-item + .kb-usage-item { margin-top: 12px; }
.kb-usage-item b { font-size: 13.5px; color: var(--c-text); }
.kb-usage-item p { font-size: 12.5px; color: var(--c-text-2); line-height: 1.75; margin: 4px 0 0; }
@media (max-width: 760px) {
  .kb-grid { grid-template-columns: 1fr; }
}

/* ---------- 讲师条 ---------- */
.tutor {
  display: flex; gap: 18px; align-items: center;
  background: #fff; border: 1px solid var(--c-border);
  border-radius: var(--radius-lg); padding: 18px 22px;
}
.tutor-avatar { width: 88px; height: 88px; border-radius: 50%; object-fit: cover; flex: 0 0 auto; }
.tutor b { font-size: 15.5px; font-weight: 600; margin-right: 10px; }
.tutor-tags { font-size: 12.5px; color: var(--c-primary-dark); background: var(--c-primary-50); padding: 2px 10px; border-radius: 4px; }
.tutor p { font-size: 13.5px; color: var(--c-text-2); margin: 6px 0 0; line-height: 1.7; }
.tutor p b { font-size: 13.5px; margin: 0; color: var(--c-text); }
.tutor-in-hero { align-items: center; background: none; border: none; padding: 0; margin: 18px 0 26px; }
.tutor-in-hero .tutor-avatar { width: 76px; height: 76px; }

@media (max-width: 640px) {
  .tutor { gap: 14px; padding: 16px; }
  .tutor-avatar { width: 64px; height: 64px; }
  .tutor-tags { display: block; margin-top: 4px; }
}

/* ---------- 表格内列表与购买链接 ---------- */
.tbl-list { list-style: none; margin: 0; }
.tbl-list li { position: relative; padding: 1px 0 1px 13px; line-height: 1.65; }

/* ---------- 进阶版课程卡图标 ---------- */
.adv-card { position: relative; padding: 14px; border: 1px solid var(--c-border); border-radius: 8px; display: flex; flex-direction: column; }
.adv-card > b { padding-right: 44px; }
.adv-ico {
  position: absolute; top: 12px; right: 12px; width: 34px; height: 34px;
  border-radius: 9px; background: #EEF4FA; color: var(--c-primary);
  display: flex; align-items: center; justify-content: center;
}
.adv-ico svg { width: 18px; height: 18px; }
.tbl-list li::before {
  content: ""; position: absolute; left: 0; top: 11px;
  width: 5px; height: 5px; border-radius: 50%; background: var(--c-primary);
}
.tbl-buy { font-size: 13.5px; white-space: nowrap; }

@media (max-width: 640px) {
  .part-head h2 { font-size: 21px !important; }
}

/* ---------- 首页入口卡（按页面导流） ---------- */
.entry-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-items: start; }
.entry-list { border-top: 1px solid var(--c-border); margin: 0 -12px 4px; }
.entry {
  display: block; padding: 13px 12px; margin: 0 -12px;
  border-bottom: 1px solid var(--c-border);
  border-radius: 6px; transition: .15s;
}
.entry:hover { background: var(--c-bg-2); text-decoration: none; }
.entry-top { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.entry-t { font-size: 15px; font-weight: 600; color: var(--c-text); line-height: 1.5; }
.entry:hover .entry-t { color: var(--c-primary); }
.entry-arrow { margin-left: auto; color: var(--c-text-3); font-size: 13px; white-space: nowrap; }
.entry:hover .entry-arrow { color: var(--c-primary); }
.entry-d { font-size: 13.5px; color: var(--c-text-2); margin-top: 3px; line-height: 1.65; }
@media (max-width: 980px) {
  .entry-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .entry { padding: 12px 8px; margin: 0 -8px; }
  .entry-arrow { display: none; }
}